Top surface drilling device and methods for drilling a core in a top surface

US10443311B2 · kind B2 · utility

Assignee

• TRACTO-TECHNIK GmbH & Co., KG · DE

Inventors

• Elmar Koch · Eslohe, DE
• Andreas Joachim Hanses · Lennestadt, DE
• Sebastian Fischer · Lennestadt, DE
• Martin Köper · Attendorn, DE

Key dates

• Filing date: Mar 23, 2016
• Grant date: Oct 15, 2019
• Expiry date: Nov 30, 2036

Classification

• Technology area (CPC E): Fixed Constructions
• CPC primary: E21B10/64
• WIPO field: Civil engineering
• WIPO sector: Other fields

Abstract

A top surface drilling device has a core bit and a drill head disposed in the core bit. The drill head has a smaller diameter than that of the core bit, and the core bit and the drill head can be driven at different angular speeds.